Fix ENCX24J600 packet receiving
Fix ENCX24J600 eth_output
Add support for reading MAC address
Update test_CoAP_no_threads to handle MAC address
Temporal Fix: Only compile encX24j600 library
Fix buffer for test_ENCX24J600_receive test
Add detailed comments for ENCX24J600 receive buffer wrap around
Add support for ENCX24J600 interrupt pin
Add interrupt handling API for ENCX24J600
Add test_CoAP_interrupt test
Fix return value from memcmp
Merge pull request #35 from supramaterial/feature-encX24J600-wip

Fixes ENCX24J600 packet receiving and adds initial support for Ethernet interrupt handling.